CATL battery troubleshooting

Created by Lee Dobson, Modified on Sat, 7 Oct, 2023 at 3:34 PM by Lee Dobson

Quick check troubleshooting for the CATL Batteries

Fault Type	Description	Error Handling
External Communication Error	The communication between the inverter and battery is interrupted.	1) Check the communication cable, especially the terminal definition; 2) Check settings on the inverter, such as battery type, protocol, etc.; 3) Check software version of the inverter; 4) If above checking results are normal, please contact customer service.
Internal Communication Error 1	The communication between batteries is lost and the alarm indicator is blinking.	1) Check the master/slave batteries configuration (addressing, termination, etc.); 2) Check communication links between batteries; 3) Check the firmware version of the master/slave; 4) If above checking results are normal, please contact customer service.
Internal Communication Error 2	BMS upper computer UIWARE could not communicate to the battery.	1) Check the upper computer tool (RS485/USB converter) is the one recommended; 2) Check RS485/USB driver is installed correctly on your computer; 3) Check the battery is configured as the master; 4) If above checking results are normal, please contact customer service.

Internal Communication Error 3	BMS firmware upgrading failed.	1) Check if RS485/USB driver is installed correctly on your computer; 2) Close UIWARE if it is open and make sure only upgrading software Bootloader is running on your computer; 3) Check Bootloader configuration (Port-name, baud-rate, etc.); 4) If above checking results are normal, please contact customer service.
Start-up Failure	Battery beeps and the alarm indicator is blinking when start-up.	1) Check if the alarm disappears after disconnecting battery output and pressing reset button; 2) If the alarm disappears, please restart the battery again.
Isolation Fault	Isolation fault in the DC line (excessive differential current measured).	Check the grounding of the battery system as well as the wiring. If no error is detected, shut down the system and contact customer service.